html {
  margin: 0;
  padding: 0;
  height: 100vh;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background-color: #f4f4f4;
}

// 所有元素都集成父元素的box-sizeing属性
* {
  box-sizing: inherit;

  &:before,
  &:after {
    box-sizing: inherit;
  }
}

img {
  width: 100%;
  height: auto;
  vertical-align: top;
  content: normal !important;
}

// 清除默认样式
ul,
li {
  list-style: none outside none;
  margin: 0;
  padding: 0;
}

figure {
  display: block;
  margin: 0;
}

[aspectratio] {
  position: relative;
}

[aspectratio]::before {
  content: "";
  display: block;
  width: 1px;
  margin-left: -1px;
  height: 0;
}

[aspectratio-content] {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
}

[flexContainer] {
  display: flex;
  width: 750px;
}

.block {
  margin-top: 15px;
}
